You made it. You're here. You have friends. You have a life.
My heart is so with you. If I had to go back to the pain of X living next door...
I hope you can work it out with your bro. It will be stressful with the dogs, yes. But maybe better than you think. And--as I am learning with The Work (do google The Work--really! it really helps) the future you imagine is SO much worse than the actual reality you are in.
It MAY not be as bad as you think it will be. You may be able to look at him and say: this was my husband. Now it is a man, a man I do not think very much of anymore.
I find FB a bit annoying, but it is nice to sit in tech rehearsal and scope out my DB'ing friends. I don't go to my "real" FB page anymore--too much college friends from when we were together.
I suggest meeting up there so we can talk more privately if we want.